Fuel Pump repair & replacement made easy

How does a fuel pump work?

The fuel pump is a vital part of your car’s fuel system. Its main job is to move fuel from the tank to the engine — delivering it at the right pressure to support smooth and efficient combustion.

Most modern fuel pumps are electric and are located inside or near the fuel tank. As soon as you turn the key or press start, the pump begins pushing fuel through the fuel lines, filter, and into the injectors. This allows your engine to run properly and deliver the power your vehicle needs.

By keeping fuel flowing at the correct rate and pressure, the fuel pump helps the engine start and run smoothly, supports good fuel economy and prevents engine misfires or stalling!

If you notice any signs of poor fuel delivery or hesitation, it’s best to have your fuel pump checked by a qualified mechanic.

What’s the difference between a high-pressure and low-pressure fuel pump?

Modern fuel systems often use two types of fuel pumps that work together: a low-pressure pump and a high-pressure pump, each with its own job. The low-pressure pump moves fuel forward from the tank while the high-pressure pump prepares that fuel for precise injection into the engine.

• Low-pressure fuel pump - Usually located inside the fuel tank, this pump delivers a steady flow of fuel from the tank to the engine area at moderate pressure. It ensures there’s always enough fuel available, even when accelerating, going uphill, or under load. Without it, your engine might hesitate or stall due to fuel starvation.

• High-pressure fuel pump - Found closer to the engine, often on the cylinder head in direct injection systems, this pump takes the fuel from the low-pressure pump and compresses it to a much higher pressure. This high-pressure delivery allows the fuel to atomise (break into a fine mist) for more efficient combustion, leading to better performance, fuel economy, and lower emissions.

Where is the fuel pump located?

In most modern vehicles, the fuel pump is located inside the fuel tank, usually mounted as part of a fuel pump module that includes the pump, strainer, and fuel level sensor. This setup is common in both petrol and diesel cars.

In older or performance cars, the fuel pump may be located outside the tank, either under the car near the tank or mounted along the fuel line. If you’re unsure where your car’s fuel pump is, the easiest way to find out is to check your owner’s manual or ask a qualified mechanic.

What does a fuel pump replacement involve?

Here’s what a professional mechanic typically does with a fuel pump change:

• The mechanic connects a diagnostic tool to check for any fault codes related to fuel delivery or pump pressure.
• The faulty pump is removed and replaced with a new one that matches the manufacturer’s specifications.
• If the fuel filter or other nearby parts show signs of wear or contamination, the mechanic may suggest replacing them as well.
• After installation, the mechanic checks for leaks, ensures the pump is properly sealed, and verifies correct fuel pressure.
• Once everything’s reassembled, the engine is run and the car is test-driven to make sure the issue has been fully resolved.

How do I tell if my fuel pump is failing?

A failing fuel pump can cause several noticeable issues with how your car starts and runs — but some of these symptoms can also be caused by a clogged fuel filter, so it’s important to get a proper diagnosis. Here are common signs to look out for:

• The engine may take longer than normal to start, or struggle to start at all if fuel isn’t reaching the injectors properly.
• You may notice hesitation or poor acceleration when pressing the throttle, especially under load or uphill.
• The engine may randomly cut out, particularly at idle or low speeds, due to interrupted fuel flow.
• Inconsistent fuel delivery can cause the car to lurch or surge while cruising.
• A whining or buzzing sound near the rear of the car could mean the pump is wearing out.
• If the pump isn’t regulating pressure correctly, fuel consumption can increase.

A clogged fuel filter can cause many of these same issues by restricting fuel flow to the engine. That’s why it’s best to have a qualified mechanic inspect both the pump and the filter before replacing anything!

How to start a car with a bad fuel pump

If your fuel pump is starting to fail, the engine may still turn over but not start. While there’s no guaranteed fix, here are a few emergency workarounds that might help you get going, but only temporarily!

• Cycle the ignition – Turn the key to the “on” position (without starting the engine), wait a few seconds, then turn it off. Repeat this 2–3 times to help build fuel pressure before trying to start the car.
• Tapping the fuel tank (very gently!) may temporarily free up a stuck pump motor, particularly in older external pump designs where it is accessible.
• Keep the tank at least half full – Low fuel levels can make a weak pump work even harder and cause it to fail faster.

Remember, these methods are only short-term and won’t solve the underlying problem and we do not recommend them. Continuing to drive with a failing fuel pump can leave you stranded or cause more damage.

Can the fuel pump be repaired?

In most cases, no! When a fuel pump starts to fail, it’s usually best to replace it rather than try to repair it. Modern fuel pumps are typically sealed units, especially in petrol cars, which makes repairs difficult, time-consuming, and often unreliable.

While some older or external pumps may allow for cleaning or minor fixes, serious or persistent issues usually require a full replacement to keep your engine running smoothly.

For the best results, it’s a good idea to have a professional mechanic diagnose the issue.

How much does a fuel pump replacement cost?

Replacing your fuel pump typically costs around £450 on average, with prices ranging from £300 to £800. The final cost depends on your vehicle’s make and model, as well as the specific parts recommended by your car's manufacturer.

What does a ClickMechanic fuel pump replacement quote cover?

Unless otherwise stated, the quote will cover:

• The cost of the fuel pump
• Coming to you
• Fitting of the parts
• Disposal of the old parts (unless you request to keep them)
• VAT (if applicable)
• 12-month parts and labour warranty

Can a mobile mechanic replace the fuel pump?

Yes, a mobile mechanic can replace your fuel pump at your location. This service allows you to get professional repairs without the hassle of towing your car to a garage.

However, if your vehicle is not drivable or requires specialised equipment that isn’t available with mobile services, then a garage might be recommended. If this is the case, we offer free collection and delivery for all drivable vehicles needing to go to a garage (a fee applies if it cannot be driven).